I have missed key quests in the past because of all the low level quest icons cluttering the mini map, and quite enjoy having finally completed everything. As long as this hypothetical quest repeating feature stayed optional I wouldn't mind. Personally I prefer having completed one time quests to remain completed. If I want to do repeatable quests or quest-like activities I have 12 daily quests per day, 6 leve quests per day, 3 clan mark bills per day, sightseeing log, hunting log for each class and an unlimited amount of fates which work just like quests (kill mobs, gather flowers, kill "boss", escort).